| OBSERVER | NUMBER | MEAN %E | M E | NUMBER | MEAN %E | M E | |
| ANDERSON PETER E. | 30 | 1.6821 | 0.1950 | ||||
| BARONI SANDRO | 9 | 2.2057 | 0.3051 | 12 | 2.2220 | 0.0958 | |
| BARTON W. | 3 | 2.4005 | 0.4589 | ||||
| BLEWETT LES & ANNE | 10 | 2.4610 | 0.2826 | ||||
| BOWRON CARL F. | 42 | 2.0181 | 0.1514 | 11 | 1.8361 | 0.2877 | |
| BULDER HENK | 23 | 1.9147 | 0.1186 | 19 | 1.9623 | 0.1603 | |
| CHORLEY J. W. A. | 10 | 2.1802 | 0.3864 | ||||
| COOPER TIM | 16 | 2.1911 | 0.1514 | ||||
| DEMEIS SALVO | 3 | 2.2155 | 0.7348 | ||||
| DILUCA R. | 16 | 1.9037 | 0.1460 | 10 | 1.8502 | 0.1767 |